Q1 · hard · AI-verified
A box of mass 20 kg is pushed along a horizontal surface with a force of 60 N. If the coefficient of kinetic friction is 0.2, what is the net acceleration of the box? (Take g = 10 m/s²)
- 2 m/s²
- 3 m/s²
- 1 m/s²
- 0.5 m/s²
Q2 · easy · AI-verified
According to Newton's Third Law of Motion, when a gun fires a bullet, the gun recoils backward. If the mass of the gun is 4 kg and the mass of the bullet is 0.04 kg, and the bullet moves at 200 m/s, what is the recoil velocity of the gun?
- 20 m/s
- 0.5 m/s
- 4 m/s
- 2 m/s
Q3 · medium · AI-verified
A machine does 500 J of work in 10 seconds. What is its power output?
- 500 W
- 5000 W
- 5 W
- 50 W
Q4 · medium · AI-verified
A force of 10 N displaces a body by 5 m in the direction of the force. The work done is:
- 2 J
- 15 J
- 0 J
- 50 J
Q5 · easy · AI-verified
What is the SI unit of force?
- Newton (N)
- Joule (J)
- Pascal (Pa)
- Watt (W)